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本文借助于X射线衍射和扫描电镜手段,观察和分析了不同真空单辊快淬线速度下获得的快淬带横截面上的组织。结果表明:1)当真空单辊线速度约为25m/sec时,磁性能最佳,磁能积(BH)_(max)=5.6～6.2MGOe;2)不同真空单辊线速度下,Nd-Fe-B快淬合金带的显微组织差别极大,当线速度较低时(<20m/Sec),快淬带子呈现以Nd_2Fe_(14)B相为主的晶态组织,当线速度较高时(>30m/sec),快淬带子的结构趋向于非晶态,而线速度介于上述两种线速度之问(20～30m/sec),就可以获得晶态和非晶态组织混合存在的快淬带子。由此证实了快淬Nd-Fe-B合金的显微组织对粘结磁体性能影响很大,而其显微组织和磁性能均明显地敏感于线速度的变化。
In this paper, X-ray diffraction and scanning electron microscopy were used to observe and analyze the microstructures on the cross-section of the quenched ribbon obtained under different single-roll speeds. The results show that: 1) The magnetic properties are the best when the linear velocity of vacuum single roller is about 25m / sec, and the product of BH is 5.6 ~ 6.2MGOe; 2) The microstructure of the Fe-B quenched alloy strip varies greatly. When the linear velocity is low (<20m / Sec), the quenched strip presents the crystalline structure dominated by Nd 2 Fe 14 B phase. At high (> 30 m / sec), the structure of the quenched tape tends to be amorphous, whereas the linear speed is between 20 and 30 m / sec (20 to 30 m / sec) to obtain both crystalline and amorphous Rapid mixing of existing quenching tape. It is confirmed that the microstructure of the quenched Nd-Fe-B alloy has a great influence on the properties of the bonded magnet, and its microstructure and magnetic properties are obviously sensitive to the change of the linear velocity.